电源技术2012，Vol.36Issue(8)：1111-1115,1208,6.
快淬工艺对Mg2-xLaxNi(X=O～0.6)合金电化学贮氢性能的影响
Influence of rapid quenching on electrochemical hydrogen storage performance of Mg2-xLaxNi (x=0-0.6) alloys
摘要
Abstract
In order to improve the electrochemical hydrogen storage performance of the Mg2Ni-type alloys, Mg in the alloy was partially substituted by element La, and melt-spinning technology was used for fabricating the Mg2_xLaxNi (x=0, 0.2, 0.4 and 0.6) alloys. The structures of the as-cast and spun alloys were characterized by XRD, SEM and HRTEM. The electrochemical hydrogen storage performance of the alloys were tested by an automatic galvanostatic system. The influences of the rapid quenching on the structure and the electrochemical hydrogen storage performances of the alloys were investigated in detail. It is found that the substitution of La for Mg obviously changes the phase composition of the alloys. For x≤0.2, such substitution leads to forming small amount of secondary phases LaMg3 and LajMg,7 without altering major phase Mg2Ni. The major phase of the alloys are changed into the (La, Mg)Ni3+ LaMg3 phases by increasing La content to x≥0.4. The substitution of La for Mg markedly enhances the glass forming ability of the Mg2Ni-type alloy, and all the as-quenched alloys exhibit a nanocrystalline/amorphous structure. The action of the rapid quenching on the electrochemical performance of the experimental alloys is associated with the chemical composition of the alloys. The rapid quenching notably enhances the electrochemical hydrogen storage performances of the Mg18La0.2Ni alloy, but it exerts a completely adverse function for the Mg14La0.6Ni alloy, for which the change of the major phase caused by La substitution is responsible.关键词
Mg2Ni型合金/快淬/La替代Ni/电化学贮氢Key words
Mg2Ni-type alloy/ rapid quenching/ substituting Mg with La/ electrochemical hydrogen storage分类
信息技术与安全科学引用本文复制引用
马志鸿,李波,赵栋梁,胡锋,张羊换..快淬工艺对Mg2-xLaxNi(X=O～0.6)合金电化学贮氢性能的影响[J].电源技术,2012,36(8):1111-1115,1208,6.基金项目
国家自然科学基金项目(50961001,50871050) （50961001,50871050）
内蒙古自治区自然科学基金重大项目(2010ZD05) （2010ZD05）
